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I thought I had solved this problem with banding by switching to 'tone mapping'. But now it's come back, and I'm not sure why.

With the render options 'save' dialog as 32 bit exr's or 16 bit pngs. (it doesn't seem to make a difference weather I have 8 Bit dithering checked) The files that get saved by cinema4d have banding. This shows up when I import them to after effects, and when I preview them in finder.

If I take a screenshot of the cinema 4d picture viewer, and then import that image into after effects it looks great, no banding.

activate "float" buffers

That is what I mean in my original post by "I thought I had solved this problem with banding by switching to 'tone mapping'."

I have switched my Render Buffer Type to Float(Tonemapped) before my post. I tried switching it back to 8 bit, back to float buffer, exporting different file types, restarting cinema, all before I posted.

I tried to make a screen recording to show you I did it like you said, but the compression makes it worse. But I promise I have changed to Float(tonemapped)

pls put your renders here to check.

The results were the same.

I'll try again tomorrow and post results again.

(happy new year)

Tested the same thing again, and same results. same banding.

Picture viewer looks great. 32 bit exr in After Effects has banding. Screenshot of picture viewer in AE has no banding.

your AE project is 8bit

Here is is on 32 bit with the same exact problem:

Is there anything else I can try? Can you try and download the file and render it out and see if it happens on your end?

we don't think it's a octane problem. There is a problem on AE for presentations of 32bit color images. When you drop the saved images to picture viewer, what do you see? It can show correctly.
Try 8 or 16 bit images to save also be sure dithering is on from camera imagers. Try to be sure AE is bad, test it in 32bit space with some internal effects. Ex. ramp, you'll see banding also here.